feat(suspend): bounce snx-rs around system sleep

snx-rs (Check Point VPN) doesn't notice that its tunnel died during
suspend: the IKE keepalive is interrupted and the SAML cookie may
expire, but the daemon happily sits on dead sockets after resume.
`snxctl status` keeps reporting "Connected" while no traffic
actually flows, so the user has to manually disconnect+reconnect.

Install an /etc/systemd/system-sleep/ hook that stops the user-scope
snx-rs.service before suspend and starts it on resume. The tunnel is
left disconnected after resume; the waybar toggle (or any
`snxctl connect`) re-establishes it, going through SAML only if the
cached cookie has actually expired.

The hook enumerates logged-in users via loginctl and skips any that
don't have snx-rs.service enabled, so it's a no-op on machines that
don't use the VPN.

Also teach run_onchange_after_deploy-etc.sh.tmpl to install files
under etc/systemd/system-sleep/ with mode 0755 (systemd ignores
sleep hooks that aren't executable).

1 files changed, 45 insertions, 0 deletions

diff --git a/etc/systemd/system-sleep/50-snx-rs b/etc/systemd/system-sleep/50-snx-rs
new file mode 100755
index 0000000..5241126
--- /dev/null
+++ b/etc/systemd/system-sleep/50-snx-rs
@@ -0,0 +1,45 @@
+#!/bin/sh
+# Bounce the user-scope snx-rs (Check Point) tunnel around suspend/hibernate.
+#
+# Problem: during suspend the IKE SA keepalive is interrupted and the SAML
+# session cookie may expire. snx-rs doesn't detect this — the daemon
+# happily sits on dead sockets after resume, so `snxctl status` reports
+# "Connected" while no traffic actually goes through. The user has to
+# manually disconnect+reconnect (which re-triggers the SAML browser flow).
+#
+# Fix: stop the daemon before suspend, start it after resume. The tunnel
+# is left disconnected on resume — user clicks the waybar toggle (or any
+# `snxctl connect`) to re-establish, which goes through SAML if and only
+# if the cached cookie has actually expired. Net result:
+#   - waybar correctly shows "disconnected" immediately on resume
+#   - one click reconnects (often without re-doing SAML)
+#   - no stale "Connected"-but-dead state
+#
+# Invoked by systemd-suspend(8) / -hibernate / -hybrid-sleep with
+#   $1 = pre|post   $2 = suspend|hibernate|hybrid-sleep|suspend-then-hibernate
+set -eu
+
+case "$1" in
+  pre) action=stop ;;
+  post) action=start ;;
+  *) exit 0 ;;
+esac
+
+# Iterate over every logged-in user that has the snx-rs.service enabled.
+# loginctl list-users gives us "UID USER" pairs.
+loginctl list-users --no-legend 2>/dev/null |
+  awk '{print $1, $2}' |
+  while read -r uid user; do
+    [ -n "$uid" ] && [ -n "$user" ] || continue
+    runtime="/run/user/$uid"
+    [ -d "$runtime" ] || continue
+    # Skip users without snx-rs enabled to avoid spurious "Unit not found".
+    runuser -u "$user" -- env \
+      "XDG_RUNTIME_DIR=$runtime" \
+      "DBUS_SESSION_BUS_ADDRESS=unix:path=$runtime/bus" \
+      systemctl --user is-enabled snx-rs.service >/dev/null 2>&1 || continue
+    runuser -u "$user" -- env \
+      "XDG_RUNTIME_DIR=$runtime" \
+      "DBUS_SESSION_BUS_ADDRESS=unix:path=$runtime/bus" \
+      systemctl --user "$action" snx-rs.service || true
+  done